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Abstract
Panax notoginseng is one of the most valuable medicinal species. However, its mitochondrial genome has not been reported yet. We aimed to determine the mitogenome sequence of P. notoginseng. We de novo assembled the mitogenome with Illumina short reads and Nanopore long reads. The mitochondrial genome of P. notoginseng has a multipartite structure consisting of interconversion between a “master circle” and numerous “subgenomic circles” through recombinations mediated by 64 pairs of repetitive sequences. Among the multipartite structure, seven subgenomic circles were best supported. Six of the seven subgenomic circles shared an 852 bp conserved fragment. The complete mitogenome of P. notoginseng was 662,479 bp long including 34 mitochondrial protein-coding genes (PCGs), three rRNA, and 19 tRNA genes. We identified 166 microsatellite repeats and 26 long-tandem repeats. Phylogenetic analysis resolved a tree that was mostly congruent with the phylogeny of Apiales species described in the APG IV system and the tree built with the chloroplast genome sequences. A total of 12 mitochondrial plastid DNA fragments were identified. Lastly, we predicted 591C-to-U RNA editing sites in the coding regions of mitochondrial PCGs. The mitochondrial genome will lay the foundation for understanding the evolution of Panax species.
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